What happens when dilute hydrochloric acid is added to iron fillings?

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What happens when dilute hydrochloric acid is added to iron fillings? Tick the correct answer.

(a) Hydrogen gas and iron chloride are produced
(b) Chlorine gas and iron hydroxide are produced
(c) No reaction takes place
(d) Iron salt and water are produced

Note: In a typical reaction, the Iron fillings displace the Hydrogen chloride to react with the Chlorine in order for the following reaction to take place:

2HCl + Fe → FeCl2 + H2

Thus, the correct answer will be

(a) Hydrogen gas and iron chloride are produced.

Why does the colour of copper sulphate solution change when an iron nail is dipped in it?

Hydrogen gas

Hydrogen gas is a colorless, odorless, tasteless and mostly harmless gas that you can find in many natural sources. It is also one of the most abundant elements in the universe. However, hydrogen gas has many potential uses such as powering cars or generating electricity. If you have hydrogen gas and ignite it, oxygen from the air will react with it to create heat and water vapor.

Hydrogen gas is an extremely popular fuel source because it’s abundant and doesn’t produce any emissions. However, hydrogen gas is not efficient and the energy produced isn’t utilized as high as some other fuels such as gasoline.

Iron or ferrous chloride

Iron or ferrous chloride is a chemical compound with the chemical formula FeCl2. It can be produced industrially by a reaction of hydrated ferrous chloride with hydrochloric acid. This is a typical reagent used to make aqua regia (a mixture of nitric and hydrochloric acids), which is often used to dissolve gold chlorides. The compound is highly soluble in water and yields pale green solutions.

The compound is white, but typical samples are often off-white. FeCl2 crystallizes from water as the greenish tetrahydrate. This is the form that is most commonly encountered in commerce and the laboratory. The white compound, however, can also be found.

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